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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0559b6d3775b10f90abc84b22be126725bd5906cb1b308fe2c379eb4bca6cbbb' 
  AND token = 'iIM9Hcpadrcdu5mGYvknJOibvHn2eLN52TTFZsDZa3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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