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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7706eca107c8b7cf659791f4dbe82a94fa490c1743b8a2e022650bfe57d1b81b' 
  AND token = 'rHncXDvr5Mp6/UNijk00PzeI97zlAd+TvBA71GPRT7M=' 
  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"
    }
  }
}