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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3b6ef0876ef23b48df90fb77c3f0f173c7a1e73a15b6209befc5fc82ff840a' 
  AND token = 'y8FmmlGuMu+8f/0XHlF8RMJuJZA5nYCu6gSsujsGsJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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