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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153640e9e08a59c03050a545fdb1de67177f44a4044c8c55d75326f7db7d6fe1' 
  AND token = 'gjDH9BptnIbLOhuDHLN3/S1MB4BTqFUd35PrElSU8Yo=' 
  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"
    }
  }
}