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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6864799e0d621d3e9b59bb0198296a5ece09639e0875b92c4d80e01bfd34bddd' 
  AND token = 'qqgEwbyb8H0zH6NcgS97ZtL+MfFA5rAfMp7NujJQnvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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