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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b4d6f1ab3f339f356f377c82f8aa92c10ae6f8d5f118e7351660b4d67660c5' 
  AND token = '73A4VJCqdpPWuUDLDhvJqDzqhmcIxXAkJYuVD5thSNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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