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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6d6e349ced9e4a6e82e87b9fca7db219d474cabb17ca8098a1bc6f1618deb7' 
  AND token = '3rVX/gluuWBcj+7grGyPFG/VXc+UEDATQ1i2/emYD+I=' 
  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"
    }
  }
}