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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcf2c7dc5a7cd3a401a81a74a8155cec0bb2beaba65a14d029388fcbea9d73a' 
  AND token = 'Qg8buMHG+OzoApa/qVNhpQYQ38bglL3V2V4nK4tjLiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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