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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9195062c5b2ef174a12fb48a751fb80d7507b8162059f51ff3f2283ee73a185a' 
  AND token = 'QiM8QGgy2C50IhM2VJlEGFs6Snfd8rHr7qfXiiL6/IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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