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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411a585818af7100b79bc404a1d536c82c56e48b0a89a365605c705f0b4811f2' 
  AND token = 'cQbL/w4mSSzIrNXIv3fsj3fUZu8/AEKOBVCzdjz4q7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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