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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50d401bc45cefe3b7544bbd88fa29c933e9139a4b0b3ac28e68aa09d33072d0' 
  AND token = 'z+oeFzEkma+hDeaQgFLRNtN/glSuZ4J7ZJ1hWNe0tMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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