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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e38f4e51df4e3044602c90cad973db18bd9210188b930a680f9fd0f52a8c8b9' 
  AND token = 'dgiOfHSNaaNwqHOTao9tpI40kfsQg3XKYzqg2RjQkts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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