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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48ddc30cdff38c2936ec895bb05299bab237374a923334cc60ca0c09c1c1c58' 
  AND token = 'CKpChwKo5b21MF123yBZys1nZXYrnMiq5aI/4x6h03Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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