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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022c9799c98efced11f8306419f4a2005672ff39dfd0c83366d86ab9f6df1c0a' 
  AND token = 'Q1WTatS9UgLJzTvWP5pDZj+P+g4/NuqrDzjpXMe05Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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