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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cca1e315553ba32b4fbbcd12fe6f97e6bd1c07bfb21d4489f428a4be7bf987' 
  AND token = 'ZqEaMT9xgRO82qpDK9DpRw3H5H1DvkhJkkwmHSVb1Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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