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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7652665bbde46be2adc016ca5d00727d1b6e6e688ae30a194d4f3a8d54f6a3d' 
  AND token = 'wM6yYoHwvkXjdyuWpPzpxFL6qx2pSoyi+i8zlINi+K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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