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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3be09a6c8bd90888a4b730b626bf3f71a2f5fd3a46fcf07dc7d9b97677b17c' 
  AND token = 'cvV+knOi3AT7qrwH27y0SmHRIGaRDi/Pvh0MGya8Scs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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