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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbc170b923f3751fe20ef6d4a6a5bc8be51ab266307305a13d82e0509ef8f70' 
  AND token = '5hRKT4kzi0jvRTMhkwIYv7NFqTH8IqZPI5ETlN271w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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