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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85efad84e24e48c8b3d51f87cac7221bd69f5819d8ac036b6636e82bd6fc7e5a' 
  AND token = '8T3nLpE5mJxpuP5z+Awy3lLJqW9alFW4pGoAuGmhaA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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