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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99627aeb99f592c8ca1e772a1443b0d314ab5faba288c275c78500c205c83baa' 
  AND token = '3n5eKFALCiK2aDmBye6+ZPKpZWFedXVaj4AvIABKIn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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