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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee5fe6a46d4b7f181a6f5957823e580d3900838f67c183108bb8060c30a90c4' 
  AND token = 'KyajOgOnBDHSNsP/XRely6UmDP893Fdv/iiM1a1Y/Cg=' 
  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"
    }
  }
}