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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b1e7063b5cb91441d1ab354d065b399557dab06feb75e1d4cf486f4d8d80c9' 
  AND token = 'lNH+DXeDs7klF8Hm7Vr39/U/pGJucSCxLcdaovdv8BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}