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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a9e5fd437eb2c5618c81731b48232ccc358c83bb8d43e5587141c471a12a6c' 
  AND token = '6NnDmGK1fhED4tgO4nVq5+eSlgaklrS/ce9qptZ6sP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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