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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790ae447cf7f89e5217a1f0f2f283d5fccc3a40a460c1cedefc78391ae8e053d' 
  AND token = 'U4C7UPIX0mUXjdkgWMQA/W9UnJGNvkWQJnEXp+grCmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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