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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a579500eef86a53077b4bbc83b4968c00129bc253a3c62b7d3bc512d7bea8c74' 
  AND token = '4MXgGGmd6Yp6pQ0G6xrlPXO5fL9ZORdAUgW5M7EMHuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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