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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d73b15d26eb5fc704122561f1fe9e6a7ec83194aa4fd46964f7fc390eadaf9' 
  AND token = 'F1TWXp4tcc9Q3B/F2mCDPcHZ9AG9Z+amAjiGtIRE2Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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