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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c94f535126f8411c37de0e0ddea035e767f1b1cbfe67a3726fd63756e9e13a0' 
  AND token = '4WugQLajfCqiW6TInSf8/UgzTvs4On10DBnufPm5VTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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