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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f740dac1a593524a4c02bfd78038b5b0e4ebc3a625b049c57c26a80af0eab85' 
  AND token = '/WIBNPwczM2kOPF+GkcoGvNf5CJ72WdYv5XeidMj8RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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