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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7df8241a3320f9bc83ffa1757526f73d9b80f5672e94e8cff18da96557221d3' 
  AND token = '5QzD51x6/5wPmxr4HSRi4BqKs5qWVdvS9iWegJT24Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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