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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ce6c441548124ad25d0927453252794ab723b75e379c0f069acba7b132e445' 
  AND token = 'qfmpKMrsGJM/aSVIg6MjO/R7oeNsFlX/LEme3tT7b5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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