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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd4b681be35189580c71bb2aa9fa4d9cec20312de4b70f49014b54bd42c3f93' 
  AND token = 'NNH8Abow5egAZMLI7x6fsYpRWAqxSnRsTGOZVSwmkiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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