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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbe025cbc18a3b0dc3b4d65b2f4fd8a96d238060662f233ffef18c8917b0db9' 
  AND token = 'avv+gH3h/7hG8sohCYXK+twElDe0sHgWo9SG1bCxOr8=' 
  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"
    }
  }
}