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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372343d9abf85cde64a44f2a117287089ce681dc2a7add588afca9d3e380b41a' 
  AND token = 'GawrquaJe8zE0PNGQb7DLjAgUO8n7pjVsQ5/8JbOhb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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