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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e52138ae288b4ce33d3fc5a041176a1c1e8aa4f8fdc798d91e0c4d9293bd20' 
  AND token = 'SLvXos/ME8QN3uRAzK5x+1i9ZhVuW95o2MJrN4s0PsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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