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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a199e3f1db10336c4b47c66312bc9ff7f975404959567da970030fefba4f7b51' 
  AND token = 'k0w2Pp951hE77/b276SZsFRfrxXF8rRZ2DISiywNKpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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