SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdbae9c22ecb36b17ff49204cfeb0b677b7073de3bc5bd59678f2a65c2aa1f2' 
  AND token = 'S/Oh5y/JDZKVMgBM57kV+ju+TXPF4fXTt6XPv8mEQmQ=' 
  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"
    }
  }
}