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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8044f1f42ef7f0621ac789eb1c880aef6d5d4e68faf38cc45d111f09fc02bcf' 
  AND token = 'IljiwgmzzuGiN1SWBxJ8gFPR+U7dy9iL5UPCMpyVcBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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