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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491db336a2e9e00cafa6e619dc43a24b0c42a111a72c75955935f7bd57139bc7' 
  AND token = 'jL5qd+U3qM/3/s85vYbuVe6upjU0WfxgEM7VgjLQm1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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