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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89279808e7034d71dcc43c2c06d68014bb2cb57c2aeb3926cdfcad305f34c2b8' 
  AND token = '0HuTQI4ExUdi9fgHzFJdm6AfRyux4hO9wUjKOPRwiIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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