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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6a0a56374cff926f9c6036ca20ea0d684e560284b7584be2dd5d0bb692ab21' 
  AND token = 'wdoZEy1TEMwaZFO91ZGyBkPmM2WIl8RtCSyCsdCe0W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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