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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d15d4a905a1e2e3431b43ad30a593dadcd8f0aa52cc32c61f48d217436e35c7' 
  AND token = 'Hzhh47oaYS4HFvQtKLnR3OzBa8/lpKtPwYjjWL8uoto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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