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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc4a5d16603b7b57c613895760051f75af85315cd009b5d2bb2ed5e39b20118' 
  AND token = 'YbyuIYWR3YjeFmrTkzSHOrHzSwx5TLupWNljggA+Uw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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