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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7457e938b1fb56f40900d4a4534a2760daaea7d3180fe0837addc4ef40a1a4' 
  AND token = '1ODAl6yMnZlGZDixrFQgbq2Wk5Pw+xVf/h+J9qPkvWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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