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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a50912546af6df5f9d11456821d188ba120c020c62b6c6ac69e9b0a010a7bc' 
  AND token = 'R55Y8HtefiAJUh9QV22KK68+IKvQL92po1HacktUq5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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