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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f620512be464345869ba94f69b51485b5e2d22a620402af2513eda3c5e452b9' 
  AND token = '9/e/6u/woTbJosifjrOxQ76UaiIlKG1gSQu7xRsenqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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