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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba659c68a62e088f540cb825ed42c04bddd697abc37a067aacb662ac6e08650a' 
  AND token = 'hgdpKcGGS2ltTRX5cDsuMaszttnl8GhuU+2hAL2F6+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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