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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c907c9c905520a79b286b1077dfc86b8de26ba079b956a1be240ee478f5e0f' 
  AND token = '/MfEx4mJKMEAuhoWIiE9iOtXcfagGj4Kym7cttndyH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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