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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba440333cc2b2d683d64e87b964e836408b45c49c8e527d3d15f49ae3ba090d' 
  AND token = 'Exm+3mlP5GqFBvlM9Ia5ShMsV+/hIYZiknQ35gmB3sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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