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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fdc7bae5493ae849400f84d74d4e34b8f5085c82eace10ce22cc4ea2e45e7b' 
  AND token = 'ylBvwWNcHOpVYAY8v2EJ2KR6AJDJXdTk1keKnMgxTIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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