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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098e5ad9617e4016b93c1a86cbf567eb69bd55a36ac4b6d0c4e7fe74ceb3aac5' 
  AND token = 'q1R/xIgbY6J+9DVAUoANW4qINmASHo81xPz7AYq6Gh4=' 
  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"
    }
  }
}