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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8d80f1b5a2d541512132a908a55ff57de3ad8a72c30654e75dcf2bd99ffd4a' 
  AND token = 'yRnScDVcQJrzOya/TzNvl7wkmsqzlYQ5SaUn0hECVh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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