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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accbc0f60140b3ae09a7bdc45528e8919312c23ae6354fc7b385ed90a46df618' 
  AND token = '47GchH25Syhpkb1ixMvH8//aVqd3TU+S912Z4J+rmnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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