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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ab6fc5d1c907f4942520ee4cfe22534dc2d0f8109860613e2f1ea909061e47' 
  AND token = '3xrI5cadcB4e7IJFUKC3xz0QbiGuuy3e3aNp2v8olJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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